We present a novel cooling method that uses the phase separation and evaporative cooling of 3He to reach and continuously maintain sub-kelvin temperatures. While less complex than a dilution refrigerator, the system performs similarly to a continuous 3He cryostat but with a simpler design, a more efficient cooldown process, and a significantly smaller 3He requirement. Our prototype demonstrated a base temperature of 585 mK and 3 mW cooling power at 700 mK using just two gaseous liters of 3He. Lower temperatures could be expected in systems with improved heat exchangers and pumping efficiency.
@article{arxiv.2503.10754,
title = {A continuously-cooled 3He/4He phase separation refrigerator},
author = {P. H. Kim and M. Hirschel and J. Suranyi and J. P. Davis},
journal= {arXiv preprint arXiv:2503.10754},
year = {2025}
}
Comments
New patent-pending cryogenic system developed by Zero Point Cryogenics. https://zpcryo.com/